/*
 * Copyright (C) 2007 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.inject.internal;

import com.google.common.base.Objects;
import com.google.common.collect.ImmutableSet;
import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.inject.spi.BindingTargetVisitor;
import com.google.inject.spi.Dependency;
import com.google.inject.spi.HasDependencies;
import com.google.inject.spi.ProviderKeyBinding;

import java.util.Set;

final class LinkedProviderBindingImpl<T> extends BindingImpl<T> implements ProviderKeyBinding<T>, HasDependencies, DelayedInitialize {

    final Key<? extends javax.inject.Provider<? extends T>> providerKey;
    final DelayedInitialize delayedInitializer;

    private LinkedProviderBindingImpl(InjectorImpl injector, Key<T> key, Object source, InternalFactory<? extends T> internalFactory, Scoping scoping, Key<? extends javax.inject.Provider<? extends T>> providerKey, DelayedInitialize delayedInitializer) {
        super(injector, key, source, internalFactory, scoping);
        this.providerKey = providerKey;
        this.delayedInitializer = delayedInitializer;
    }

    public LinkedProviderBindingImpl(InjectorImpl injector, Key<T> key, Object source, InternalFactory<? extends T> internalFactory, Scoping scoping, Key<? extends javax.inject.Provider<? extends T>> providerKey) {
        this(injector, key, source, internalFactory, scoping, providerKey, null);
    }

    LinkedProviderBindingImpl(Object source, Key<T> key, Scoping scoping, Key<? extends javax.inject.Provider<? extends T>> providerKey) {
        super(source, key, scoping);
        this.providerKey = providerKey;
        this.delayedInitializer = null;
    }

    static <T> LinkedProviderBindingImpl<T> createWithInitializer(InjectorImpl injector, Key<T> key, Object source, InternalFactory<? extends T> internalFactory, Scoping scoping, Key<? extends javax.inject.Provider<? extends T>> providerKey, DelayedInitialize delayedInitializer) {
        return new LinkedProviderBindingImpl<T>(injector, key, source, internalFactory, scoping, providerKey, delayedInitializer);
    }

    public <V> V acceptTargetVisitor(BindingTargetVisitor<? super T, V> visitor) {
        return visitor.visit(this);
    }

    public Key<? extends javax.inject.Provider<? extends T>> getProviderKey() {
        return providerKey;
    }

    public void initialize(InjectorImpl injector, Errors errors) throws ErrorsException {
        if (delayedInitializer != null) {
            delayedInitializer.initialize(injector, errors);
        }
    }

    public Set<Dependency<?>> getDependencies() {
        return ImmutableSet.<Dependency<?>> of(Dependency.get(providerKey));
    }

    public BindingImpl<T> withScoping(Scoping scoping) {
        return new LinkedProviderBindingImpl<T>(getSource(), getKey(), scoping, providerKey);
    }

    public BindingImpl<T> withKey(Key<T> key) {
        return new LinkedProviderBindingImpl<T>(getSource(), key, getScoping(), providerKey);
    }

    public void applyTo(Binder binder) {
        getScoping().applyTo(binder.withSource(getSource()).bind(getKey()).toProvider(getProviderKey()));
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(ProviderKeyBinding.class).add("key", getKey()).add("source", getSource()).add("scope", getScoping()).add("provider", providerKey).toString();
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof LinkedProviderBindingImpl) {
            LinkedProviderBindingImpl<?> o = (LinkedProviderBindingImpl<?>) obj;
            return getKey().equals(o.getKey()) && getScoping().equals(o.getScoping()) && Objects.equal(providerKey, o.providerKey);
        } else {
            return false;
        }
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(getKey(), getScoping(), providerKey);
    }
}
